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Peak Irradiance/Intensity of the LCD?  

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cpritchard
(@cpritchard)
New Member
Peak Irradiance/Intensity of the LCD?

I was wondering if anyone has measured the irradiance of the SL1? I work for a company that develops resins, and we're trying to decide whether or not to buy an SL1, but I can't seem to find this specific bit of information. We need this information to see if we can use this printer as a platform for development without having to drastically change our resin formulations. We would be replacing our aging Autodesk Ember printer, which has an intensity of about 20mw/cm^2.

Any help would be greatly appreciated!

 

Posted : 17/06/2019 3:59 pm
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(@)
Illustrious Member
RE: Peak Irradiance/Intensity of the LCD?

You might do better logging into the e-shop and using the CHAT feature to contact Prusa engineering.

Posted : 17/06/2019 10:26 pm
maxwell.m
(@maxwell-m)
Eminent Member
RE: Peak Irradiance/Intensity of the LCD?

Agreed.  Their chat people can set you up with additional info.  They might not have that figure themselves, but they can forward you to someone who does.

Posted : 17/06/2019 10:30 pm
cpritchard
(@cpritchard)
New Member
Topic starter answered:
RE: Peak Irradiance/Intensity of the LCD?

They've not been able to help me the past few times I've asked the chat, but I'll give it another shot!

Posted : 18/06/2019 11:42 am
maxwell.m
(@maxwell-m)
Eminent Member
RE: Peak Irradiance/Intensity of the LCD?

Anycubic Photon advertises 25W light (40W total unit power) with 115mmx65mm build volume, and I believe the SL1 has a higher intensity since the sizes of the screens are the same but layer times are shorter.

25W * (1000 mW /1 W) = 25,000 mW

150mm * (1 cm / 10 mm) = 15 cm  and 65mm * (1 cm / 10 mm) = 6.5 cm

15 cm * 6.5 cm = 97.5 cm^2

25,000 mw / 97.5 cm^2 = 256 mw/cm^2

Since the screen size is actually a little bigger than the 'build volume' it is probably more like 200mw/cm^2, assuming I did not just fail at math (which is possible; I am scrambling to get this in while at work).  If I did this right and the SL1 has an even higher light intensity, you are looking at over 10x your minimum intensity for your resin, even if the reflectors are less than 100% efficient.  Rather than changing the resin, I would lower the time of exposure per layer.

Be sure to check my math, but I think you should be fine. 🙂

 

EDIT:  I found an old post of mine.  "The Prusa SL1 uses a 405nm 25watt UV LED source according to their chat support , basically what the anycubic photon specs are. "  Does this help?

This post was modified 2 years ago by maxwell.m
Posted : 18/06/2019 4:51 pm
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